- Report #: NT ACOU 102
- Approved: June 1999
This NORDTEST method specifies a field method using a special kind of sound source signal, known as a “Maximum Length Sequence”. This is later referred to as the MLS method. It is used to determine the sound reduction index, as defined by IS0 140-5 of facade elements and facades.
This method is an alternative to the loudspeaker method defined in IS0 140-5.